Changing default cxx_stdlib to libc++

[db]

On 11 Mar 2018, at 02:47, "Kenneth F. Cunningham" <ken.cunningham.webuse at gmail.com> wrote:
> On 2018-03-10, at 12:23 PM, db wrote:
>> Except for building from source for minor versions and revbumps, especially large binaries, and for ports that have open defects. Oh well…
> Well, everything for 10.6.8 users on MacPorts is about to get supremely better. Hard to be too upset about that!

I don't doubt that! What I don't understand is, why would port be allowed to build a port from source on a certain system that already failed on the buildbot, and what's worse, be left with a port in a non-working state, while downloading binaries would work, because it couldn't donwload something that's failed to build.